通常,好的系统结构是“清真寺”型的,即高层扇出系数较(),中间扇出系数较(),底层扇入系数较高。
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You have created an Oracle 10g database named SALES, which will be used by an application named SalesOrders. Users of the SalesOrders application complain that application response time is slow when they generate reports. The SalesOrders application accesses a table that contains 10 million rows. You decide to create an index on this table using the NOLOGGING option so that the index creation process is completed in the least amount of time. Which of the following is NOT true about an index created with the NOLOGGING option?()
A. The index can be changed from NOLOGGING to LOGGING
B. The index cannot be recovered even in the ARCHIVELOG mode.
C. The index can only be created if the base table is created with the NOLOGGING option.
D. The index can be recovered if you perform a backup after the CREATE INDEX statement.
劳动合同的期限只有一种即固定期限。
A. 正确
B. 错误